bob schieffer talks with michael mccaul and senator tom car burned, the ranking member of the senate homeland temerity -- homeland security community. -- committee. the rea errors begin at noon airs begin at noon eastern. listen to them all on c-span radio here in the washington d.c. area. nationwide on ex-im satellite radio, channel 119. download are free app for your smartphone or go online to cspanradio.org. >> she was very bright, she was very political, which is why she and lincoln got together in the first place. she was extremely well educated. she had all these things going for her, but she had suffered a series of tremendous emotional blows. three of her four children died. her four sons died, one in the white house, one shortly after her husband's assassination sitting next to her at the theater. the kinds of grief this woman was going through were amazing. we found out she was not crazy. mary todd was a very significant person, and i hope someday we get a better view of her, of the range of things that influenced her life, not just a tragedy. >> more on mary todd lincoln i